/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/PolygonFunctions.h
Apply a morphological "close" operator to a list of closed polygons  first offsetting by +Offset, then by -Offset. If Offset is negative, this will instead function as an 'Open' operation
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="GeometryScript|PolygonList", Meta=(ScriptMethod)) static [FGeometryScriptGeneralPolygonList](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptG-) PolygonsMorphologyClose ( [FGeometryScriptGeneralPolygonList](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptG-) PolygonList, [FGeometryScriptPolygonOffsetOptions](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptP-_5) OffsetOptions, double Offset, bool & bOperationSuccess, bool bCopyInputOnFailure )